本文实例为大家分享了C#实现上传下载图片的具体代码，供大家参考，具体内容如下

1.首先我们通过流来上传下载图片，所有操作只停留在流这一层

MemoryStream ms; //左侧按钮 private void button1_Click(object sender, EventArgs e) { ms = new MemoryStream(); Image bi =pictureBox1.Image; bi.Save(ms, pictureBox1.Image.RawFormat);//将图片存入流中 } //右侧按钮 private void button2_Click(object sender, EventArgs e) { Image img = Image.FromStream(ms, true); pictureBox2.Image = img; ms.Close(); }

分别点击左侧和右侧按钮，则将左侧图片加载到右侧：（PictureBox的SizeMode属性可以设置图片的填充方式）

2.通过将图片转化为流然后转化为字节；将字节转化为流，然后加载图片

图片转化为字节的代码：

public static byte[] ImgToByte(Image img, System.Drawing.Imaging.ImageFormat imgFormat) { Bitmap bmp = new Bitmap(img); MemoryStream memStream = new MemoryStream(); bmp.Save(memStream, imgFormat); memStream.Seek(0, SeekOrigin.Begin); //及时定位流的开始位置 byte[] btImage = new byte[memStream.Length]; memStream.Read(btImage, 0, btImage.Length); memStream.Close(); return btImage; }

字节转化为图片的代码：

public static Image ByteToImg(byte[] btImage) { MemoryStream memStream = new MemoryStream(); //Stream memStream = null; memStream.Write(btImage, 0, btImage.Length); memStream.Position = 0; memStream.Seek(0, SeekOrigin.Begin); //Bitmap bmp = new Bitmap(memStream, true); Image img; try { img = Image.FromStream(memStream, true); memStream.Close(); //img = new Bitmap(memStream); } catch (Exception ex) { img = null; MessageBox.Show(ex + ""); } finally { memStream.Close(); } return img;}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。